SEGMENT INFORMATION - Schedule of Segment Results (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Premiums revenue	$ 30,514	$ 28,261
Services revenue	1,334	1,062
Total revenues	32,112	29,611
Investment income	264	288
Benefits	26,535	25,124
Operating costs	3,380	3,042
Depreciation and amortization	183	209
Total operating expenses	30,098	28,375
Income from operations	2,014	1,236
Product
Segment Reporting Information [Line Items]
Premiums revenue	30,514	28,261
Service
Segment Reporting Information [Line Items]
Services revenue	1,334	1,062
External Revenues
Segment Reporting Information [Line Items]
Total revenues	31,848	29,323
Operating Segments | Insurance
Segment Reporting Information [Line Items]
Total revenues	30,937	28,699
Investment income	170	162
Benefits	26,675	25,251
Operating costs	2,534	2,364
Depreciation and amortization	154	186
Total operating expenses	29,363	27,801
Income from operations	1,574	898
Operating Segments | CenterWell
Segment Reporting Information [Line Items]
Total revenues	5,095	4,818
Investment income	0	0
Benefits	0	0
Operating costs	4,644	4,483
Depreciation and amortization	59	53
Total operating expenses	4,703	4,536
Income from operations	392	282
Operating Segments | Product | Insurance
Segment Reporting Information [Line Items]
Premiums revenue	30,514	28,261
Operating Segments | Product | CenterWell
Segment Reporting Information [Line Items]
Premiums revenue	0	0
Operating Segments | Service | Insurance
Segment Reporting Information [Line Items]
Services revenue	252	275
Operating Segments | Service | CenterWell
Segment Reporting Information [Line Items]
Services revenue	1,082	787
Operating Segments | External Revenues | Insurance
Segment Reporting Information [Line Items]
Total revenues	30,766	28,536
Operating Segments | External Revenues | CenterWell
Segment Reporting Information [Line Items]
Total revenues	1,082	787
Eliminations/ Corporate
Segment Reporting Information [Line Items]
Total revenues	(3,920)	(3,906)
Investment income	94	126
Benefits	(140)	(127)
Operating costs	(3,798)	(3,805)
Depreciation and amortization	(30)	(30)
Total operating expenses	(3,968)	(3,962)
Income from operations	48	56
Eliminations/ Corporate | Insurance
Segment Reporting Information [Line Items]
Total revenues	1	1
Eliminations/ Corporate | CenterWell
Segment Reporting Information [Line Items]
Total revenues	4,013	4,031
Intersegment Eliminations
Segment Reporting Information [Line Items]
Total revenues	$ (4,014)	$ (4,032)